求翻译：Within thirty (30) days after receiving telefax or telex notice of any damage to the VESSEL constituting an actual or a constructive total loss, the BUYERS shall notify the SELLERS in writing or by telefax or telex of its agreement or disagreement under this sub paragraph. In the event the BUYERS fails to so notify the SELLERS, then such failure shall be construed as a disagreement on the part of the BUYERS. This Contract shall be deemed as rescinded and canceled and the BUYERS receive the refund as hereinabove provided and the provisions hereof shall apply.是什么意思？

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